Is here even a breakneck and trouble-free opening because some answers are really long and not to the point.
Answers:
What program is cause that popup? Is it one of your anti-malware progs? If so UPDATE and RUN it. If not, afterwards run this online scan to see what happen:
http://support.f-secure.com/enu/home/ols...
It should find and verbs any mal-ware explicitly in actuality on your contrivance if it's in that to instigate next to.
More info such as OS and what prog that popup is coming from would bring back you a much more concise answer. ;
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Malware Removal Guide
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Dealing near Unwanted Spyware and Parasites
http://mvps.org/winhelp2002/unwanted.htm...